Fix "X-Amz-User-Agent" in blacklist #3120
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The header blacklist contains lowercase header names only, except "X-Amz-User-Agent". This causes this header not to be filtered out, leading to an error with some proxies that remove the empty header:
This commit lowercases the header, which correctly removes the header from the signature.
Related: #2259
Resolves: #3119
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